It's been a while since I've visited William Webster's website, Christian Resources. I was pleasantly surprised to find that the site has been redesigned, see for yourself, here. Available now on the site are multiple audio lectures on Roman Catholic Tradition, it's Roots and Evolution.
William Webster has written an outstanding volume on the concept of Roman Catholic "Tradition." Details on this book can be found, here. This is one of the books I keep on my desk- it is a valuable resource, and I use it often when evaluating Catholic claims.